Screw starter



FIG. 1 is a perspective view of a screw starter showing my new design;

FIG. 2 is a back elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a side elevational view thereof; and

FIG. 6 is a vertical cross-sectional view thereof taken along line 6--6 of FIG. 3. 

The ornamental design for a screw starter, substantially as shown. 